If we are talking about the sum of the interior angles, the sum is (11-2)x180 degrees.
This is 180x9 or 1620 degrees. The sum of the exterior angles is always 360 so that is why i assumed we were talking about the interior angles.
Given a polygon with n sides, the sum of the interior angles is (n-2)x180 degrees.
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The sum of the interior angles of any regular polygon of n sides is equal to 180(n - 2) degrees. 1620 degrees
All polygons, including an undecagon (11-sided figure) have a sum of exterior angles of 360 degrees.
The answer is 11 sides If a polygon with 10 sides the sum of the interior angles are 1440° So 1440°+180°= 1620°
(13-2)*180 = 11*180 = 1980 degrees.
An 11 sided polygon is a undecagon.